- A
Enable Multi-AZ deployment.
Enable Multi-AZ deployment. This provisions a synchronous standby replica in a different AZ and provides automatic failover, ensuring the instance can withstand an AZ failure.
- B
Create a read replica in a different AZ.
Why wrong: Creating a read replica in a different AZ is incorrect because read replicas are asynchronous and do not provide automatic failover; they require manual promotion.
- C
Enable automated backups with a short retention period.
Why wrong: Enabling automated backups with a short retention period is incorrect because backups are used for recovery after failure, not for withstanding an ongoing AZ failure.
- D
Enable deletion protection on the DB instance.
Why wrong: Enabling deletion protection is incorrect; it prevents accidental deletion but does not provide availability during an AZ failure.
- E
Enable provisioned IOPS for the DB instance.
Why wrong: Enabling provisioned IOPS is incorrect; it improves performance but does not provide high availability against AZ failure.
How to Withstand an Availability Zone Failure with RDS Multi-AZ
This SOA-C02 practice question tests your understanding of reliability and business continuity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO steps should a SysOps administrator take to ensure that an RDS for MySQL instance can withstand an Availability Zone failure? (Choose 2)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable Multi-AZ deployment.
To withstand an Availability Zone failure, the RDS instance must provide automatic failover to a standby in a different AZ. Only Multi-AZ deployment (Option A) achieves this by provisioning a synchronous standby replica and enabling automatic failover. Automated backups (Option C) are for point-in-time recovery, not high availability, so they do not help during an ongoing AZ failure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Multi-AZ deployment.
Why this is correct
Enable Multi-AZ deployment. This provisions a synchronous standby replica in a different AZ and provides automatic failover, ensuring the instance can withstand an AZ failure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a read replica in a different AZ.
Why it's wrong here
Creating a read replica in a different AZ is incorrect because read replicas are asynchronous and do not provide automatic failover; they require manual promotion.
- ✗
Enable automated backups with a short retention period.
Why it's wrong here
Enabling automated backups with a short retention period is incorrect because backups are used for recovery after failure, not for withstanding an ongoing AZ failure.
- ✗
Enable deletion protection on the DB instance.
Why it's wrong here
Enabling deletion protection is incorrect; it prevents accidental deletion but does not provide availability during an AZ failure.
- ✗
Enable provisioned IOPS for the DB instance.
Why it's wrong here
Enabling provisioned IOPS is incorrect; it improves performance but does not provide high availability against AZ failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas with Multi-AZ deployments, assuming a read replica in a different AZ provides automatic failover, when in fact read replicas are asynchronous and require manual promotion, making them unsuitable for automatic AZ failure recovery.
Detailed technical explanation
How to think about this question
Multi-AZ deployments use synchronous replication to keep the primary and standby instances in sync; Amazon RDS handles the failover automatically by updating the DNS record to point to the standby instance. The standby replica is not accessible for reads or writes until failover occurs, and automated backups are taken from the standby to reduce I/O impact on the primary. In real-world scenarios, Multi-AZ is essential for meeting SLAs that require 99.95% or higher uptime for database tiers.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Multi-AZ deployment. — To withstand an Availability Zone failure, the RDS instance must provide automatic failover to a standby in a different AZ. Only Multi-AZ deployment (Option A) achieves this by provisioning a synchronous standby replica and enabling automatic failover. Automated backups (Option C) are for point-in-time recovery, not high availability, so they do not help during an ongoing AZ failure.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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